/**
 * 溢出
 */
#include <iostream>

using namespace std;

constexpr int INVALID_FREQ1 = 0xffffffff;
constexpr unsigned int INVALID_FREQ2 = 0xffffffff;


void demo(const unsigned int freq) {
    std::cout << freq << std::endl;
}

int main() {
    std::cout << INVALID_FREQ1 << std::endl;
    std::cout << INVALID_FREQ2 << std::endl;
    demo(INVALID_FREQ1);
}